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​Some people’s mouth is a bit open when they relax their myofacial muscles, the ones that are used to clench the jaw. In a completely well aligned mouth, the top row of teeth rests gently on the bottom row when the mouth is closed and the face is relaxed. But the jaws can be aligned in many ways, and a whole slew of factors can cause the mouth to hang open when resting, exposing the teeth and gums, and causing all sorts of problems in the long run. This harmless little characteristic can thus be a big problem.